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Siem Reap is accessible by direct bus from Phnom Penh (five to six hours; $5 to $13) on all major lines, and from Bangkok (10 to 12 hours; $15 and not in one vehicle—the first bus drops you at the border, then you have to navigate your way to Cambodia and on). The road between Siem Reap and the border is usually a slow-moving morass in the rainy season. Neak Krorhorm Travel can help you arrange all bus trips.