~Hello there! ^_^
Your question: What physical feature marks the eastern boundary of the cultural subregion known as European Russia..?
Your answer: The Ural Mountains physical feature marks the Eastern boundary o f the cultural subregion known as European Russia.
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This is known as the visible spectrum of electromagnetic radiation, or visible light. This is the frequency of light that we see, and which illuminates our world as it reflects off of objects. Compared to the full spectrum of electromagnetic radiation, the visible light portion is actually quite small.
Early 1800's. The Erie Canal was built in 1817
Islamic culture. if it is what you're looking for.
The correct answer is - Caribbean Sea.
Honduras is a country that belongs into the Central America region, with an excellent position by being a country that has access to two large bodies of water. From its eastern side, is located the Caribbean Sea, and in this sea is located the the biggest island of this region, the island nation of Cuba.
Honduras and Cuba are pretty close to each other, and the countries have traditionally good relations and collaboration, which is continuing to this day.
Both countries can be classified as Latino countries, as the dominant language and culture in them is the Spanish one.