33 C.F.R. § 167.53

In the approaches to Portland, ME: Southern approach

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(a) A separation zone 1 mile wide is established and is centered upon the following geographical positions:

LatitudeLongitude
43°27.00′ N70°03.48′ W.
43°07.82′ N69°54.95′ W.

(b) A traffic lane 1 1/2 mile wide is established on each side of the separation zone.

[USCG-2010-0718, 75 FR 77533, Dec. 13, 2010]