How many letters does the top answer for “a river in eastern texas that flows south into the gulf of mexico” have?

The most common answer is sabine (6 letters).

Crossword clue: a river in eastern texas that flows south into the gulf of mexico

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

sabine 6 letters wn-def

a river in eastern Texas that flows south into the Gulf of Mexico