3,695 are known to have drowned or are missing

(CNN) —The number of refugees who have entered Europe by sea and land this year has passed 1 million, the International Organization for Migration said Tuesday.

The latest updates for irregular arrivals into Europe in 2015 as of Monday put the total number of migrants at 1,005,504, according to the organization.

The vast majority -- 971,289 -- have come by sea, according to the figures. Another 34,215 have traveled over land.

Among those traveling by sea, 3,695 are known to have drowned or remain missing as they attempted to cross the sea on unseaworthy boats, according to IOM figures.

The numbers of migrants into Europe have exploded in 2015 as an unprecedented surge of humanity has fled wars, persecution and poverty in the Middle East and Africa.

The number of migrants entering Europe by crossing the Mediterranean in 2014 was 219,000, according to the United Nations.
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