Hill, elevation 1,014 ft (309 meters) Dhuey Hill, elevation 912 ft (278 meters) Montpelier Hills, elevation 951 ft (290 meters) Waters Sturgeon Bay and Little Sturgeon are considered biodiversity hotspots because they support a large number of different fish species. North of the peninsula, warm water from Green Bay flows into Lake Michigan on the surface, while at the same time, cold lakewater enters Green Bay deep underneath. This is a major reason why oxygen levels in the bay are often too low. In the Lower Green Bay, a counterclockwise circulation of water along the surface of the bay is thought to carry cleaner water south along the western shore, and nutrient-rich water from the Fox River north along the eastern shore. This circulation is thought to begin south of the mouth of the Oconto River on the west side. It changes direction at Pensaukee, north of Long Tail Point and continues northward to Sturgeon Bay. The position of Long Tail Point marks the east-west division between the two masses of water. Walleye found in the Sturgeon Bay and Little Sturgeon area had 87% more PCBs than walleye from the western side of Green Bay at the mouth of the Oconto River. This fits what is known about the distribution of PCBs which spread from industries in the Fox River Valley. Dry valleys and obsequent versus resequent streams Dry valleys are in the western and central areas of the peninsula. Some carry water during the spring snow melt to a larger drainage or stream, but several have been found which appear unrelated to current drainage patterns. They may have been formed from melting glaciers or drainage patterns prior to the glaciers. Small obsequent streams flow from near the crest of the escarpment into Green Bay, and small resequent streams flow down the longer slope into Lake Michigan. The Kewaunee River, the Ahnapee River, Lilly Bay Creek and streams in the towns of Forestville and Clay Banks are all resequent streams. Spawning Spawning areas and other fish habitat areas adjacent to the islands north of the Door Peninsula were mapped in 1978. Lake whitefish spawn in Moonlight Bay. From 1962 to 1965, 39 smallmouth bass nests were observed in a variety of county waters. Water depth varied from 17 inches to at least five feet and possibly deeper. 27 of the nests were made on gravel or rubble, 8 were made