A regional dialect is not a distinct language but a variety of a language spoken in a particular area of a country. Some regional dialects have been given traditional names which mark them out as being significantly different from standard varieties spoken in the same place.
There are many regional dialects in the US, but it's difficult to give an exact number due to the diverse linguistic landscape. Some estimates suggest there could be anywhere from 24 to over 50 distinct regional dialects across the country.
There are many English dialects, but they can generally be categorized into three main groups: British English, American English, and Commonwealth English. Within these groups, there are countless regional variations and accents that make up the diverse landscape of English dialects.
Northern, Midland, and Southern
Northern, Midland, and Southern
tuscan, umbrian, and spanish
There are multiple Japanese dialects, with around 15 main regional variations in Japan. These dialects differ in pronunciation, vocabulary, and grammar, adding complexity to the Japanese language landscape.
May not be understood by most speakers of English. A good example is Chinese language -- I understand that there are over 300 dialects and many Chinese cannot understand some regional dialects.
In some regional dialects, that would be "calm bomb."
Inland North
The Philippines has over 170 dialects, which are mostly regional or provincial languages. However, Tagalog and English are the official languages of the country.
There are several dialects of Japanese spoken throughout the country, with some estimates suggesting around 15 main regional dialects. These dialects can vary significantly in vocabulary, grammar, and pronunciation, contributing to the rich diversity of language in Japan.
China has a lot of different dialects due to its large population and geographic diversity. Mandarin is the official language, but there are numerous regional dialects such as Cantonese, Shanghainese, and Hokkien, each with its own unique characteristics.