stovepipe
n.— «The Pombo bill would put the agreement into law through 2012, when the 125-mile limit would go into effect and open most of the original 181 area to drilling. It would, however, maintain a 100-mile limit on a narrow section known as the “stovepipe” off Alabama abutting the Florida line.» —“Bush at odds with senators, others on offshore drilling proposal” by Bill Kaczor in Pensacola, Fla. Al.com (Ala.) Oct. 5, 2005. (source: Double-Tongued Dictionary)