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The northern frontiers of India are defined largely by the Himalayan mountain range, where the country borders China, Bhutan, and Nepal. Its western border with Pakistan lies in the Punjab Plain and the Thar Desert.
There's actually more geological differences between china and india (30,000 ft high himalayan mountains, two different tectonic plates) than between china/eastern russia and europe (both are on the same tectonic plates and the ural mountains of central russia, the commonly accepted boundary between europe/asia... plate is different than a continent, though, and part of the North American plate in eastern Siberia is in Asia. Should this be a separate continent? Asia includes other plates as well, including the Iranian and Arabian plates. Indeed, India and Australia are on the same plate, but completely separate continents.