Cambodia is a country in mainland Southeast Asia. It borders Thailand, Laos, Vietnam, the Gulf of Thailand and covers a total area of approximately 181,035 km2 (69,898 sq mi). The country is situated in its entirety inside the tropical Indomalayan realm and the Indochina Time zone (ICT).
The Sacramento River is the principal river of Northern California in the United States and is the largest river in California. Rising in the Klamath Mountains, the river flows south for 400 miles (640 km) before reaching the Sacramento–San Joaquin River Delta and San Francisco Bay. The river drains about 26,500 square miles (69,000 km2) in 19 California counties, mostly within the fertile agricultural region bounded by the Coast Ranges and Sierra Nevada known as the Sacramento Valley, but also extending as far as the volcanic plateaus of Northeastern California. Historically, its watershed has reached as far north as south-central Oregon where the now, primarily, endorheic (closed) Goose Lake rarely experiences southerly outflow into the Pit River, the most northerly tributary of the Sacramento.
The Krishna River is a river in the Deccan plateau and is the third-longest river in India, after the Ganges and Godavari. It is also the fourth-largest in terms of water inflows and river basin area in India, after the Ganges, Indus and Godavari. The river, also called Krishnaveni, is 1,400 kilometres (870 mi) long and its length in Maharashtra is 282 kilometres. It is a major source of irrigation in the Indian states of Maharashtra, Karnataka, Telangana and Andhra Pradesh.
The Godavari is India's second longest river after the Ganga river and drains the third largest basin in India, covering about 10% of India's total geographical area. Its source is in Trimbakeshwar, Nashik, Maharashtra. It flows east for 1,465 kilometres (910 mi), draining the states of Maharashtra (48.6%), Telangana (18.8%), Andhra Pradesh (4.5%), Chhattisgarh (10.9%) and Odisha (5.7%). The river ultimately empties into the Bay of Bengal through an extensive network of distributaries. Measuring up to 312,812 km2 (120,777 sq mi), it forms one of the largest river basins in the Indian subcontinent, with only the Ganga and Indus rivers having a larger drainage basin. In terms of length, catchment area and discharge, the Godavari is the largest in peninsular India, and had been dubbed as the Dakshina Ganga.
The Mekong or Mekong River is a trans-boundary river in East Asia and Southeast Asia. It is the world's twelfth-longest river and the third-longest in Asia with an estimated length of 4,909 km (3,050 mi) and a drainage area of 795,000 km2 (307,000 sq mi), discharging 475 km3 (114 cu mi) of water annually. From its headwaters in the Tibetan Plateau, the river runs through Southwest China, Myanmar, Laos, Thailand, Cambodia, and southern Vietnam. The extreme seasonal variations in flow and the presence of rapids and waterfalls in the Mekong make navigation difficult. Even so, the river is a major trade route between Tibet and Southeast Asia. The construction of hydroelectric dams along the Mekong in the 2000s through the 2020s has caused serious problems for the river's ecosystem, including the exacerbation of drought.
The Kaveri is one of the major Indian rivers flowing through the states of Karnataka and Tamil Nadu. The Kaveri River rises at Talakaveri in the Brahmagiri range in the Western Ghats, Kodagu district of the state of Karnataka, at an elevation of 1,341 m above mean sea level and flows for about 800 km before its outfall into the Bay of Bengal. It reaches the sea in Poompuhar, in Mayiladuthurai district. It is the third largest river – after Godavari and Krishna – in southern India, and the largest in the state of Tamil Nadu, which, on its course, bisects the state into north and south. In ancient Tamil literature, the river was also called Ponni.
The Brahmaputra is a trans-boundary river which flows through Tibet (China), Northeastern India, and Bangladesh. It is known as Brahmaputra or Luit in Assamese,Yarlung Tsangpo in Tibetan, the Siang/Dihang River in Arunachali and Jamuna River in Bengali. It is the 9th largest river in the world by discharge, and the 15th longest.
The Santa Ana River is the largest river entirely within Southern California in the United States. It rises in the San Bernardino Mountains and flows for most of its length through San Bernardino and Riverside counties, before cutting through the northern Santa Ana Mountains via Santa Ana Canyon and flowing southwest through urban Orange County to drain into the Pacific Ocean. The Santa Ana River is 96 miles (154 km) long, and its drainage basin is 2,650 square miles (6,900 km2) in size.
Penna is a river of southern India. This is a unique river in world where after originating from Nandi hills, it flows as two different streams, one in North and South directions. The Penna rises in the Nandi Hills in Chikkaballapur District of Karnataka state, and runs north and east through the states of Karnataka and Andhra Pradesh to empty into bay of bengal in Andhra Pradesh. It is 597 kilometres (371 mi) long, with a drainage basin covering 55,213 km2: 6,937 km2 in Karnataka and 48,276 km2 in Andhra Pradesh. Along with this main stream there is another stream south towards Tamilnadu with the name Then Pennai or south Pennar which further moves towards the east to empty into the Bay of Bengal.The Penna river basin lies in the rain shadow region of Eastern Ghats and receives 500 mm average rainfall annually.
The South Pennar River is a river in India. Bangalore, Hosur, Krishnagiri,Kaveripattinam, and Cuddalore are the important cities on the banks of South Pennar river. This is the second longest river in Tamil Nadu, with a length of 497 km, after the Kaveri. Chandapura, Anekal, Hosur, Bagalur, and Chengam are the major industrial settlements on its banks. The river is severely polluted by industrial waste as it flows through major industrial areas in the eastern suburbs of Bangalore, Industrial parks of Hosur and Chengam.
Palar is a river of southern India. It rises in the Nandi Hills in Chikkaballapura district of Karnataka state, and flows 93 kilometres (58 mi) in Karnataka, 33 kilometres (21 mi) in Andhra Pradesh and 222 kilometres (138 mi) in Tamil Nadu before reaching its confluence into the Bay of Bengal at Vayalur about 75 kilometres (47 mi) south of Chennai. It flows as an underground river for a long distance only to emerge near Bethamangala town, from where, gathering water and speed, it flows eastward down the Deccan Plateau. The Towns of Bethamangala, Santhipuram, Kuppam,Mottur, Ramanaickenpet, Vaniyambadi, Ambur, Melpatti, Gudiyatham, Pallikonda, Anpoondi, Melmonavoor, Vellore, Katpadi, Melvisharam, Arcot, Ranipet, Walajapet, Kanchipuram, Walajabad, Chengalpattu, Kalpakkam, and Lattur are located on the banks of the Palar River. Of the seven tributaries, the chief tributary is the Cheyyar River.
Kallanai is an ancient dam built by Karikala of Chola dynasty in 150 CE. It is built across the Kaveri river flowing from Tiruchirapalli District to Thanjavur district, Tamil Nadu, India. The dam is located in Thanjavur district, 15 km from Tiruchirapalli and 45 km from Thanjavur. It is the fourth oldest water-diversion or water-regulator structure in the world and the oldest in India that is still in use. Because of its spectacular architecture, it is one of the prime tourist spots in Tamil Nadu.
The Mokelumne River is a 95-mile (153 km)-long river in northern California in the United States. The river flows west from a rugged portion of the central Sierra Nevada into the Central Valley and ultimately the Sacramento–San Joaquin River Delta, where it empties into the San Joaquin River-Stockton Deepwater Shipping Channel. Together with its main tributary, the Cosumnes River, the Mokelumne drains 2,143 square miles (5,550 km2) in parts of five California counties. Measured to its farthest source at the head of the North Fork, the river stretches for 157 miles (253 km).
Karamana is a river flowing through the city of Thiruvananthapuram in Kerala, India. The river starts near the southern tip of the Western Ghats(Sahyadri Mountains) at Agastyar Koodam. The river flows 66 km westward and merges with the Arabian sea at Panathura near Kovalam. The river gets its name from Karamana, a suburb of Thiruvananthapuram city, through which it flows.
Pattukkottai is a major town in Thanjavur district in the Indian state of Tamil Nadu and also important town in Delta districts and Commercial town of Thanjavur, Thiruvarur and Pudukkottai district Coastal areas. The town came to prominence throughout Southern India after the construction of the fort by Vanaji Pandithar, a feudatory of the Thanjavur Maratha ruler Shahuji I in 1686–87. The recorded history of Pattukkottai is known from the 17th century and has been ruled, at different times, by the Thanjavur Marathas and the British. It is the headquarters of the Pattukkottai taluk of Thanjavur district and is one of the two municipalities in the district.
River Champavathi is a small river which originates in the Eastern Ghats at an altitude of 1,200 metres above mean sea level near Andra village and flows eastwards and joins the Bay of Bengal near the village Konada. The river passes through Gajapathinagaram, Nellimarla, Saripalli, Denkada, Palem and Natavalasa of Vizianagaram district. The river has four main tributaries Eduvampula Gedda, Chitta Gedda, Pothula Gedda and Gadi Gedda. The basin has a drainage area of 1,410 square kilometres. This area is divisible into Hilly terrain, Vizianagaram plains and Coastal plains.
The Vellar River is a river in the Indian state of Tamil Nadu. It originates in the Kalrayan Hills, and flows generally eastward through Salem, Perambalur, and Cuddalore districts, before flowing into the Bay of Bengal near Parangipettai. The river has a total length of 150 kilometres (93 mi), and its drainage basin covers an area of 7,504.346 square kilometres (2,897.444 sq mi) in Cuddalore, Perambalur, Salem, Kallakurichi, Ariyalur, Namakkal, Tiruchirappalli, and Dharmapuri districts.
Kosasthalaiyar River, also known as Kortalaiyar, is one of the three rivers that flow in the Chennai metropolitan area.
The Vellar River or South Vellar River is a non-perennial river in the Indian state of Tamil Nadu that flows southeast into the Palk Strait, part of the Bay of Bengal.
The Ambuliyar or Ambuli River is a non-perennial river in the Pudukkottai and Thanjavur districts of Tamil Nadu, India, that flows southeast into the Palk Strait.
India 