1) Castle in Okinawa Prefecture 
== Philological analysis == The Yarazamori Gusuku Inscription (1554) contains phrases, `pile gusuku` (くすくつませ) and `pile up gusuku and ...` (くすくつみつけて). Apparently gusuku in these phrases to refer to stone walls. In the Omoro Sōshi (16th–17th centuries), the term gusuku is written as `くすく,` or `ぐすく`...