It seems like many coastal water 'provinces' lack the proper label for shallow sea as this example from the world map shows:
gyazo.com/8cab529c84f4eca09b163fb00d576cbc
Going after color of the sea also does not really help here:
gyazo.com/ffec9a1b876ab4c7dd559c6157e92a53
gyazo.com/8cab529c84f4eca09b163fb00d576cbc
Going after color of the sea also does not really help here:
gyazo.com/ffec9a1b876ab4c7dd559c6157e92a53