Tatvan ( Datvan, Kurdish: Têtwan)is a city at the western end of Lake Van, and is the regional center of the identically-named district within Bitlis Province in eastern Turkey. It has about 96,000 inhabitants. The mayor is Abdullah Ok (BDP).
Tatvan is connected by Train ferry across 96 km of Lake Van to Van which avoids 250 km of railway construction in mountainous terrain. This is a low capacity route which will be replaced by a proper railway when traffic increases.