Gat mort
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Physical characteristics
Source
• location	Hostens
• coordinates	44°29′20″N 0°36′35″W / 44.48889°N 0.60972°W / 44.48889; -0.60972
• elevation	77 m (253 ft)[1]
Mouth
• location	Garonne
• coordinates	44°42′14″N 0°26′18″W / 44.70389°N 0.43833°W / 44.70389; -0.43833
• elevation	5 m (16 ft)[2]
Length	37 km (23 mi)
Basin features
Progression	Garonne→ Gironde estuary→ Atlantic Ocean

Gat mort is a left tributary of the Garonne, in southwest France. It is 37 km (23 mi) long.^[3]

Gat mort rises in the Landes de Gascogne Regional Natural Park, in the commune of Hostens, generally drains in a north-easterly direction through the Graves wine-growing region and flows into the Garonne as a left tributary after about 37 km (23 mi)^[3] at the municipal boundary of Beautiran and Castres-Gironde.

Gat mort flows through the following department and towns:

• Gironde (33) : Hostens, Saint-Magne, Louchats, Cabanac-et-Villagrains, Saint-Morillon, Saint-Selve, Castres-Gironde, Beautiran.