Port Ios or Yialos is the only port on the island. It provides excellent shelter from the meltemi (the Etesians) (the Etesians) but during the peak holiday period it is so noisy with l disco music and loud beer parties, that it is impossible to sleep.
Moor stern-to the quay on the east side of the inlet, where there are pickup lines, or anchor moor on the quay extension that forms the outer breakwater of the adjacent fishing boat harbor. The bottom is mud and provides excellent holding. Most of the NE side of the quay since 2009 is occupied by a laid up ferry and the rest of the NE side is used by the working ferries.
Secure your boat well off the quay as ferry arrivals cause a considerable temporary surge in the harbor. Anchoring in the bay is not permitted as it obstructs the ferries.
There is narrow cove 36°43.4′N, 25°15.9`′E just NW of the harbor. One boat can squeeze in. It is a safe anchorage there but it can develop strong and uncomfortable swell as it is exposed to the southerlies. The holding is good and it is very quiet in the evening after all the bathers have departed.