Exploration in the Albania Ionian Sea Basin began in the early 20th century and has historically focused on the shallow Tertiary Onshore play, which is characterised by small (<10 mmboe), predominantly heavy oil fields. Exploration in the Ionian Sea was transformed in 2013, when Petromanas, partnered by Shell, made a large, play-opening discovery. The 160 mmbbl Shpiragu discovery is the largest onshore find in Europe for over a decade, and accounts for a third of the total volume discovered in the Ionian Sea to date. The newly opened play is complex - Triassic to Eocene fractured carbonates, buried to more than 6,000 metres. This Exploration Basin report provides a detailed analysis of exploration in this basin, including costs, discovered and yet-to-find volume and prospect and play economics. It is accompanied by multiple excel downloads.