Welsh independence must be "on the table" after Brexit, Plaid Cymru's new leader has said.
Adam Price said if there was a "hard" Irish border and the UK left the EU single market and customs union "the appetite for Scottish independence and Irish unity" would be "insatiable".
He warned of a Wales "at the mercy of Westminster".
Comparing Brexit to the Titanic, Mr Price told Plaid's autumn conference in Cardigan that the "iceberg's looming".
The assembly member, who defeated Leanne Wood in the party's recent leadership contest, said voters should be given a chance to "avert a disaster" through a referendum on the final Brexit deal.
Downing Street said the prime minister's Chequers plan for Brexit would create a free trade area for industrial and agricultural goods with the EU based on a "common rule book", and resolve concerns about the border between Northern Ireland and the Irish Republic.
But Theresa May's proposals have been attacked by both Brexiteer and pro-EU Tory MPs, while the European Union's chief Brexit negotiator Michel Barnier has said he is "strongly" opposed to key parts of her plan.
