The island of Jabuka (eng.: Apple) and Brusnik are the only two islands among 1185 Croatian islands that are completely of volcanic origin.

The island of Jabuka (43°05,5'N & 15°27,6E; island length: 180m, highness: 97m, coastline: 700m) lies some 28 nm west (276°) of Komiza on the island of Vis. Distance from the mainland is 32,7 nm (cape Ploca, near Rogoznica). The nearest island is the island of Svetac (aka Sveti Andrija, 12.2 nm) and the lighthouse of Barjak Mali (in front of Vis island, 25,2 nm).
Due to magnetite that can be found in the black, volcanic rocks on the island, compasses become completely useless in the vicinity of this island. Boats can rarely be seen in these waters because the island lies far from all sea routes. Therefore, the island is visited only by those who have made it their destination. Jabuka can hardly be considered an island. The shoreline is not suitable for docking, the bays are not protected from winds, the steep cliffs make it impossible to build shelter, while the surrounding waters are deep (250m) and are not suitable for anchoring. The island of Jabuka is actually a very large, steep, 97 meter high cliff in the shape of a pyramid. It can only be accessed from the southwestern side during favorable weather conditions, which is rarely the case.
Placed in deep waters, isolated from other islands and channels, Jabuka is exposed to strong winds. Even moderate winds cause large waves on the open sea, therefore one needs a lot of experience and luck to dock on the island. The surrounding waters are rich in fish. Due to the harsh climate, there are only two endemic species: black lizard and the plant Centaurea (Cro.: zecina). Till some 50 years ago, the island was home to an endemic type of carnation, nowadays extinct.
 
The island of Jabuka
(43°05,5N 15°27,6E)
 

Ham Activity and Jabuka

 

The island of Jabuka has always been a challenge for amateur radio operators, attracting and drawing them as a magnet.
Let's recall the last try by 3 Croatian hams to activate the island of Jabuka for IOCA (The Islands Of Croatia Award) program:

Trying to activate Jabuka island (CI-032, MC-136, EU-016), on July 22, 2005 - Tom, 9A2AA, Luka, 9A7Z and Neno, 9A7N took off from Korcula island towards Jabuka.
After 14 hours at sea and some 100 n. miles (with a stop over to spend the night on Vis isl.), they reached Jabuka island. However, due to unfavorable weather ("dead sea", calm with high amplitudes), we could read on the Cluster: action postponed. After a few hours and numerous tries to land and unload the equipment, the new announcement said: action canceled.
The expedition failed and all the crew could do was to wait for another 14-hour return trip to Korcula island.

When there were no motorboats, only the bravest, most enduring fishermen dared go to the island in order to provide for their families by catching large fish and trapping valued lobsters. The island is both a remarkable and frightening sight during nice weather in summer but in winter, when the winds blow causing large waves, Jabuka turns into a life-threatening adventure.

There is definitely something remarkable and magnificent about these "frightening" volcanic islands containing magnetite that causes compass needles "go berserk" and influences those who come to the island of Jabuka, making them willing to torture their bodies, bear the harsh conditions and endanger their lives in order to test the limits of their spirits and presence of mind. Outdoor enthusiasts should visit Jabuka only in summer months with the help of an experienced crew.

About sharks in Jabuka area

"In July/August 2005 Richard and Jacqui Peirce mounted an expedition led by Richard and Craig Ferreira in the Central Adriatic to try to evaluate predatory shark populations by conducting a three-week at sea round the clock chumming operation...

SITE 1. – 8 miles NW Jabuka 16 hours continual chumming. One confirmed specimen Blue Shark (P. glauca) after 10 hours 15 minutes chumming. 2 metre female.
SITE 2. – 9 miles SW Jabuka. 19 hours continual chumming. Four confirmed specimens Blue shark (P. glauca). First specimen 3 metre female after 1 hour 20 minutes chumming, second specimen 2.5 metre male 45 minutes later..."
More about sharks in Jabuka area by Richard Peirce