Task: Text Categorization
Input (English): Off this country's southwest shore lie such islands it controls as Poula Wai and Kaoh Rung, while its northeast extends to a point at the end of Rotanah Kiri province. Its largest lake normally outflows across the Val Pc plain and receives such tributaries as the Srng and Sn. The cities of Pursat and Siemrab are found in the basin of that lake. For 10 points, name this country, whose eastern portion is watered by the Mekong River, which joins the outflow from Tonle Sap at Phnom Penh.
Output (English): Social Science