Khabarovsk vs Porto Velho

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Khabarovsk (Russian: Хаба́ровск, tr. Khabarovsk, IPA: [xɐˈbarəfsk] (listen)) is the largest city and the administrative center of Khabarovsk Krai, Russia, located 30 kilometers (19 mi) from the Chinese border, at the confluence of the Amur and Ussuri Rivers, about 800 kilometers (500 mi) north of Vladivostok. The city was the administrative center of the Far Eastern Federal District of Russia from 2002 until December 2018, when Vladivostok took over that role.

It is the largest city in the Russian Far East, having overtaken Vladivostok in 2015. As of the 2010 Census, its population was 577,441. It was previously known as Khabarovka (until 1893).

Source: Wikipedia

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Porto Velho (Portuguese pronunciation: [ˈpoʁtu ˈvɛʎu], Old Port) is the capital of the Brazilian state of Rondônia, in the upper Amazon River basin, and a Catholic Metropolitan Archbishopric. The population is 519,531 people (as of the IBGE 2018 estimation). Located on the border of Rondônia and the state of Amazonas, the town is an important trading center for cassiterite, the mining of which represents the most important economic activity in the region, as well as a transportation and communication center.

It is on the eastern shore of the Madeira River, one of the main tributaries of the Amazon River. It is also Rondônia's largest city, and the largest state capital of Brazil by area. The municipality occupies most of the border between Amazonas and Rondônia, and is both the westernmost and northernmost city in the state.

Source: Wikipedia