• 沖合おきあい — offshore waters
• 沖縄おきなわ — Okinawa
• 沖縄県おきなわけん — Okinawa Prefecture
• 沖釣おきづり — offshore fishing
• 沖波おきなみ — offshore waves

沖 combines the water radical 氵 with the phonetic 中 (ちゅう), evoking a central or far-off place across water. It points to the open water beyond the shore, as in 沖合 and place names like 沖縄.