Where does Hamlet say Ophelia should go, and how does she die?

In her anger Ophelia tries to return trinkets that Hamlet has given her in the past. Angrily, he tells her she should join a convent for it will stop her from becoming a "breeder of sinners." He then goes into a tirade against all women, denouncing women as a whole and denouncing marriage.

Ophelia goes mad, and later drowns in the river. Some believe it was suicide, others believe it was simply the result of insanity.

He says she should go to a nunnery. This is a pun, since at the time a nunnery was also slang for a brothel. She dies by drowning after her rant with the guard in which she intimates that Hamlet slept with her and promised to marry her.

Hamlet tells Ophelia to go to a nunnery, "Get thee to a nunn'ry, why woulds't thou be a breeder of sinners?" Basically he is telling Ophelia not to have any kids because all men are sinners and all women are liars. Ophelia later drowns herself in a creek.