I would be grateful if you read the sentence and check my articles (if something else is wrong-i would be grateful for all your comments)
India has a network of large and navigable rivers, free from the freezing effects of a severely cold climate. She has also a wealth of forests, abounding in strong timber which might be readily utilised for the construction of ships and boats.
I see no problem with the articles.
"She also has a wealth of forests," is a bit more natural.
"effects of a severely cold climate" and "might be readily utilized" are good, but a trifle elaborate.
Best wishes, - A.