Tonga
0 cu m (1 January 2007 est.)

Trinidad and Tobago
531.5 billion cu m (1 January 2008 est.)

Tunisia
65.13 billion cu m (1 January 2008 est.)

Turkey
8.495 billion cu m (1 January 2008 est.)

Turkmenistan
2.832 trillion cu m (1 January 2008 est.)

Turks and Caicos Islands
0 cu m (1 January 2006 est.)

Uganda
0 cu m (1 January 2006 est.)

Ukraine
1.104 trillion cu m (1 January 2008 est.)

United Arab Emirates
6.071 trillion cu m (1 January 2008 est.)

United Kingdom
412 billion cu m (1 January 2008 est.)