The Straits of Madagon are a passage through the Nova of Madagon. The Cylons have mined the straits, but Apollo, Starbuck, and Boomer clear the mines in their Vipers, allowing the fleet to pass through to Carillon (Saga of a Star World).
Notes
The Re-imagined Series cast makes a similar voyage through a deadlier star cloud in the season 3 episode, "The Passage."