It's a name and names have initial capital letters.
Sherlock Holmes and the River Thames are from/in the UK.
There are several bird species that are found in River Thames, including The Mute Swan, The Canada Goose, The Mallard Duck, The Greylag Goose, The Great Crested Grebe, The Coot, The Grey Heron and The Moorhen. You can also find mammals such as The Water Vole, The Otter and The American Mink.
Rwanda is a country in Africa. Rabat is the capital city in Morocco. Rashid is a city in Egypt. The Rufiji River is a river in Tanzania. The Ruvyironza River is a river in Burundi and Tanzania.
No. It's not necessary.
In 1858 the summer was unusually hot and the Thames and many of its urban tributaries were overflowing with sewage. The warm weather encouraged bacteria to thrive and the resulting smell was the great stink.
The abbreviation for river is R
Riga in Latvia is a Baltic capital beginning with "R"
No. it's not a pronoun so there's no reason it would need a capitol R.
No country starts with an 'R' and ends with a 'D'
River Rhine.
The river in the West of Mesopotamia is called the Tigris R. The River in the East is called the Euphrates R.
The Ravan River is a famous river in Russia. It begins with R and ends with N.