Cool Branch is a 2.85 mi (4.59 km) long 2nd order tributary to Tubbs Branch in Sussex County, Delaware.

Cool Branch rises about 2 miles northwest of Sycamore, Delaware, and then flows northwest to join Tubbs Branch about 0.5 miles south of Concord.

[3] Cool Branch drains 2.24 square miles (5.8 km2) of area, receives about 45.0 in/year of precipitation, has a wetness index of 681.87, and is about 8% forested.

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