My passport has expired but I have valid visa til next month.Do I have to apply for new one before I travel or can I use the same passport ?

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Global Visas

Yes,you have to apply for new passport for going anywhere in the world.For more info,you could take advice from visa and immigration experts.

[URL="http://www.globalvisas.com/countries/canada_visas.html"]immigration canada[/URL]

Actually you must receive new passport before going another country. The visa is not the document separately.