Ikura

Open any beginner's Japanese text book and you'll learn that to ask "How much?" all you have to say is "ikura desuka?" If only it were that easy. While you can get by using that phrase in most parts of the country, you'll discover that what you have learnt and what people actually say are to very different animals. 

In the areas indicated on the map with ◆ locals say, "Doredake?" In the southern part of Kyûshû, and especially in Kagoshima prefecture, indicated with ●, people may say one of the following: "Doshiko?" "Dogashiko?" or "Doreshiko?" The following video mentions this peculiarity of Kagomaben, or the Kagoshima dialect.

X marks the spots where "Naosubusa?" can be heard. (Personally, I've never come across this, and think the researchers who put this together are trying to pull my leg.)

"Namboh?" and "Nambu?" are more prevalent in western Japan and the northern and eastern half of Kyûshû ▲. "Ikohbi?" and "Ubi?" are used in isolated areas of souther Kyûshû. "Gyoosa?" is limited to parts of Okinawa /, and "Ikusa?" to Amami Ôshima ▼.

"Ikura?" and "Izura?" are more common in and around Tôkyô, central Japan, and central and western Kyûshû, +. This makes some sense as "standard Japanese" is most often associated with the dialect spoken in the capital of the country.