The ferries between Koh Kong and Sihanoukville ended a few years ago, and the service seems unlikely to return. Between the paving of the southern road, the rise in fuel prices, and the fall in foreign tourism it is no longer economically feasible, and despite the election of the Shinawatra government, tensions between the two countries are high due to various border disputes.
There are fast boats up and down the Mekong. You could take one from Chau Doc to Phnom Penh, then another from Phnom Penh to Tonle Sap, then ground transportation from Tonle Sap to Siem Reap for connections into Thailand, but as far as I know traveling exclusively by water into Thailand from Cambodia or Vietnam via scheduled service is not possible.
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