The Floodplains tiles along the river containing the Three Gorges Dam are now immune to Flood damage (though Food and Production bonuses from flooding drop by 50%). Your civilizaiton gets +20% Great Engineer Points for each Dam and Hydroelectric Dam. Provides +6 Power from renewable water sources to all your Cities. Citizens in the city with district Dam provide +0.5 Food, +0.5 Production.

Must be built adjacent to a Mountain and next to a River.

+2 Tourism
+1 extra per Era that you've advanced past this Wonder's era

一桥飞架南北，天堑变通途。
更立西江石壁，截断巫山云雨，高峡出平湖。
神女应无恙，当惊世界殊。
　　——毛泽东