Air Supplena Island (エア・サプレーナ島, Ea Sapurēna Tō) is an island that can be reached north of Venice in about 30 minutes by boat. It is primarily featured in Battle Tendency, and is where Joseph Joestar and Caesar Zeppeli do most of their Ripple training.
Air Supplena Island is the complete opposite of the warm and bright atmosphere of Venice, but makes up for it with the large looming towers of unique design. Situated in the Adriatic Sea, both the shores of Venice and Yugoslavia can be seen in the distance. The entire island is owned by Lisa Lisa.
The basic layout of Air Supplena Island is that of a round island whose borders are occupied with all manners of gothic buildings in the typical style of Venetian architecture. At the center of it is a large looming tower harboring the Hell Climb Pillar. The tower itself is surrounded by a park. The island also possesses several training grounds meant to push a Ripple trainee to their limits and special arenas where students are put to the test by their teachers.
Lisa Lisa's own quarters are quite luxurious and have a gothic interior.
In the middle of the island is a giant tower with a pillar inside that protrudes from a large pit. The pillar was built in 39 A.D., in the Roman Era, before the city of Venice was established. It was created by those who were trying to revive the Ripple technique, which had been largely wiped out due to the onslaught of the Pillar Men. It was mentioned by Caesar that many students of the Ripple have died trying to climb the pillar.
The height of the pillar is 24 meters and its greatest circumference is 7.20 meters. It was constructed with a slippery polished stone with oil flowing from the top and drenching the entirety of the pillar. The system is set up so that the oil reaches the bottom and then is taken back up to the top, so that it constantly flows much like a fountain. In order to climb the oil-covered pillar, one must use a concentrated Ripple in order to stick to the surface of the pillar, largely as part of a stamina test in which one must maintain the Ripple for a prolonged period of time. While the pillar is not perfect and is cracked at some locations, the cracks in the pillar contain traps, one of which shoots concentrated oil out of the pillar with enough cutting power to cut through a pen perfectly.
As stated by Lisa Lisa, this test only allows climbing the pillar with Ripple and no other help. There is no exit other than climbing the pillar. The higher you go the more protruding is the pillar's shape, making it gradually harder to climb. The walls surrounding the pillar are more protruding than the pillar.
The following is a timeline of Joseph and Caesar's progress going up the pillar.
Joseph's final trial took place outside Air Supplena on another smaller island appropriately named Fight Island. The island can only be accessed via a narrow walkway from the Air Supplena, due to the large stone walls surrounding the area. Inside consists of a building and a large, but shallow pit completely filled with protruding spikes. Though typically not a suitable battleground, experienced Ripple users are required to use the Ripple in order to cushion their feet and traverse the pit. Joseph was expected to battle Loggins here, but upon arriving discovered his master killed by Esidisi and engaged with him instead.
On the northeast side of the island is an area used for combat training or testing. Aside from several small trees, there are two relatively large towers shaped similar to hourglasses and are attached at the top by two ropes. The only way to reach the platforms at the top of each tower is to presumably climb a ladder. During combat, Ripple users are expected to balance on the ropes while attacking. This location is where Caesar Zeppeli had his final trial against his master, Messina.