Aral Sea fate. Since the disappearance of the Southeast Aral in 2008, Vozrozhdeniya effectively no longer exists as a distinct geographical feature. The area is now shared by Kazakhstan and Uzbekistan. In 1948, a top-secret Soviet bioweapons laboratory was established on the island, in the centre of the Aral Sea which is now disputed territory between Kazakhstan and Uzbekistan. The exact history, functions and current status of this facility are still unclear, but bio-agents tested there included "Bacillus anthracis", "Coxiella burnetii", "Francisella tularensis", "Brucella suis", "Rickettsia prowazekii", "Variola major" (smallpox), "Yersinia pestis", botulinum toxin, and Venezuelan equine encephalitis virus. In 1971, weaponized
Kazakhstan–Uzbekistan border tensions around the border – especially in the Tashkent area - in the late 1990s-early 2000s, with Kazakhstan accusing Uzbekistan of unilaterally demarcating and militarising the border; eventually in 2001 the two governments agreed to begin a full delimitation of the border. Full demarcation is currently ongoing. Kazakhstan–Uzbekistan border The Kazakhstan-Uzbekistan border is 2,330 km (1,448 mi) long and runs from the tripoint with Turkmenistan to the tripoint with Kyrgyzstan. It is Uzbekistan’s longest external boundary. The Uzbek capital Tashkent is situated just 13 km (8 mi) from this border. The border begins in the west at the tripoint with