哪里/那里->where/there 哪儿/那儿->where/there they are exactly the same, just northern people use 儿 more than southern people :)

Thank you. :)

哪里: Where 那里: There Yes we use these terms more in the middle and south of China. For 哪里, there is a special term to show humble: 哪里哪里 (means you flattered me), I believe in the north they say the same. 哪儿: Where 那儿: There Northern people add 儿 after some words. eg: north accent south accent 小孩儿 小孩子 一点儿 一点 北京人儿 北京人 四合院儿 四合院 玩儿 玩

You are right. Northern people like to use “儿” at the end of a phrase or sentence, we southern people seldom speak so. For example, I never use this word in this case. I think it's most used in Beijing.

哪里=哪儿=where, 那里=那儿=there。哪里and那里 are used in written Chinese, but 哪儿and那儿 are used in spoken Chinese. For example: 你在哪儿/哪里上学? 请把东西放在那儿/那里。