The raft enables them to find their escape from the savagery of their society.
It is through Huck's friendship with Jim and their adventures together on the river that Huck truly finds himself. He is continually confronted with the question of right and wrong and he learns to stay true to himself and follow his own heart, regardless of conventional, social, or religious mores.
Huck realizes that Jim is just as human as he is, a loving father who misses his children, a warm, sensitive, generous, compassionate individual. Huck has had to make a decision whether or not to rescue Jim when he is captured and held for return to slavery, as he faces the question of whether he should obey the law and turn in Jim. The slave loves Huck and he has been a true friend and been through many tough situations. Through his friendship with Jim, Huck learns to love the black man who is devoted and willing to do anything for Huck.
The themes that could be found in the book are the following: adventure, maturity, growth and rebirth, friendship, legality versus morality, love, racism, freedom, and the wrongness of society. The river, separate from the surrounding areas and from civilization, is a haven from society and a source for adventure. As Huck travels down the river, he starts a different life.