Pig Island is Koh Madsum, a small island in the Gulf of Thailand three to four kilometres south of Koh Samui's Thong Krut pier. It lies just east of Koh Tan, the bigger island you can see from the Thong Krut pier, and both belong to Surat Thani province. On a map, look for the two islands below the southern tip of Samui.
Ten to twenty minutes by speedboat from Thong Krut on a calm day, up to half an hour in chop or on a longtail, and about thirty minutes on the catamaran from Bang Kao. From Chaweng the van ride to the pier is the longer part of the journey, around forty five minutes; from Lamai it is closer to twenty five.
Several places share the nickname. The Bahamas has Big Major Cay with its swimming pigs. Greece has a piggy island near Skiathos. Searches for "Pig Island Phuket" usually mean this one, reached from Koh Samui, because Phuket has no equivalent. If you are in Phuket, this is a different coast and a different trip.
The island sits at about 9.370 north, 99.977 east. The pigs live on the north-facing beach, the side the boats come in on.
Every boat that stops at the pigs, with live prices.
It is a separate island just off Koh Samui, and every visit starts on Samui. Administratively both are in Surat Thani province.
From Thong Krut and the south coast beaches you can see Koh Tan clearly; Koh Madsum sits just beyond it.
No. The pigs are here, in the Gulf, off Koh Samui.