answers.input_text: short
answers.span_text: Near Tavistock Mouth Lake Saint Clair - location Lighthouse Cove
questions: where does the thames river begin and end
name: Thames River (Ontario)
contexts: Thames River North Thames River , just upstream from the confluence with the Avon River near Stratford , Ontario Name origin : after the River Thames in England Country Canada Province Ontario Region Southwestern Ontario Part of Great Lakes Basin Source - location Near Tavistock Mouth Lake Saint Clair - location Lighthouse Cove - elevation 173 m ( 568 ft ) - coordinates 42 ° 19 ′ 9 '' N 82 ° 27 ′ 15 '' W ﻿ / ﻿ 42.31917 ° N 82.45417 ° W ﻿ / 42.31917 ; - 82.45417 Coordinates : 42 ° 19 ′ 9 '' N 82 ° 27 ′ 15 '' W ﻿ / ﻿ 42.31917 ° N 82.45417 ° W ﻿ / 42.31917 ; - 82.45417 Length 273 km ( 170 mi ) Basin 5,825 km ( 2,249 sq mi ) Discharge for Chatham - average 52.9 m / s ( 1,868 cu ft / s ) - max 1,090 m / s ( 38,493 cu ft / s ) - min 8.25 m / s ( 291 cu ft / s ) Location of the mouth of the Thames River in southern Ontario