Ubli or Uble, as the local people call it, is situated on the south-west part of the island. Ubli is the port of Lastovo.

In Ubli, there are remains of the single nave Christian basilica built between the V-VI century and it was dedicated to St.Peter. Among many findings in the basilica most notable are an early Christian relief portraying, the cross and two lambs. Original is stored in the Archeological Museum in Zadar.

After the archeological research, the basilica was conserved and classified as a monument of the highest category.

From Ubli to Pasadur (west) one can enjoy walking with nice promenade 3 km long.