Sigri is at the SW corner of Lesvos. It is protected from the W by Meganisi or Sigri Island and surrounded by wonderful pristine beaches. There are many secure nearby anchorages. With the meltemi (the Etesians) it is best to anchor under the lee of the castle on the S of the town at 6 m. There is a reputation of bad holding. Be prudent and check the anchor with a snorkel.
With southerly winds it best to anchor N of the castle just off the entrance of the small fishing harbor in depths about 7-5 m. Good holding on mud. Alternately, you can go to Faneromeni N of Sigri Bay. Another wonderful totally isolated cove is further N is Cape Petrinos.
Caution: It is better to enter and exit Sigri Bay during daylight and via the S channel between Sedhousa Island and Cape Sigri. The N channel should only be used by relatively shallow draught yachts and in settled conditions, as there are minimum depths of 4.5 meters at the southern end.