Sentence:  Devils Lake is where I began my career as a limnologist in 1964, studying the lake's neotenic salamanders and chironomids, or midge flies. [...] The Devils Lake <WSD>Basin</WSD> is an endorheic, or closed, <WSD>basin</WSD> covering about 9,800 square kilometers in northeastern North Dakota. 
Meaning of the word marked with <WSD> tags:  an area of land from which water drains into a common outlet; drainage basin