Historical clue formulations

• Clear sailing areas … or, homophonically, a feature of 16-, 23-, 39- and 52-Across (and every clue in this puzzle!) — 2025-07-28
• Where cruisers cruise — 2013-04-14
• Pirates' domain — 2007-06-09
• Where pirates operate — 2003-12-24
• Pirates' domain — 1996-11-03