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ISS005-E-12804
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Spacecraft nadir point: 33.8° N, 73.2° E

Photo center point: 34.1° N, 72.7° E

Nadir to Photo Center: Northwest

Spacecraft Altitude: 208 nautical miles (385km)
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Image Caption: Tarbela Dam, Pakistan

The Indus River basin extends from the Himalaya Mountains that form the northeastern boundary of Pakistan to the alluvial plains of Sindh near the Arabian Sea coastline. Tarbela Dam is part of the Indus Basin Project, which resulted from a water treaty signed in 1960 between India and Pakistan. This treaty guaranteed Pakistan water supplies independent of upstream control by India. Designed primarily for water storage rather than power generation, the dam was completed in 1977.

Turquoise waters of the Indus River (to the south of the dam) reflect the high proportion of silt and clay suspended in waters released by the spillways (chutes on either of side of the main dam). With a volume of 142,000,000 cubic meters, the Tarbela Dam is the largest earth and rock fill dam in the world and stands 147 meters above the Indus riverbed. Its reservoir occupies an area of 37 square kilometers. While the dam has fulfilled its purpose in storing water for agricultural use in Pakistan, there have been environmental consequences to the Indus river delta. Reduction of seasonal flooding and reduced water flows to the delta have decreased mangrove stands and the abundance of some fish species.