CREATE TABLE table_204_341 (id NUMBER, "name in english" CLOB, "name in turkish" CLOB, "area  ( km2 ) " CLOB, "depth" CLOB, "location  ( districts and/or provinces ) " CLOB)

at most , what 's the biggest depth ?
SELECT "depth" FROM table_204_341 ORDER BY "depth" DESC LIMIT 1
SELECT "depth" FROM "table_204_341" ORDER BY "depth" DESC FETCH FIRST 1 ROWS ONLY