<Li> 1632--33--Pyotr Beketov descends the Lena as far as its great bend, erects the ostrog Yakutsk, and sends a detachment some 720 kilometres (450 mi) downriver (where the zimovie Zhigansk is built) and another east up the Aldan as far as the Amga (which they also ascend in search of yasak). </Li> <Li> 1633--34--Jean Nicolet discovers Lake Michigan and likely reaches Green Bay, Wisconsin . </Li> <Li> 1633--38--Ilya Perfilyev and Ivan Rebrov sail from Zhigansk in kochi some 800 kilometres (500 mi) downriver to the mouth of the Lena and sail along the coast east and west, reaching the mouths of the Olenyok, Yana, and Indigirka rivers . </Li> <Li> 1638--40--Poznik Ivanov crosses the Verkhoyansk Range into the upper reaches of the Yana, and then portages over the Chersky Range into the Indigirka River system . </Li>

When was the new world discovered by european explorers