The poem associated with the Song of the Moon Festival in the Water Margin, a classic Chinese novel, is titled "Moonlit Night on the River." This poem is renowned for its vivid imagery and emotional depth, capturing the festive atmosphere of the Mid-Autumn Festival and the camaraderie among the heroes of the Water Margin.

The "Moonlit Night on the River" is a pivotal poem in the Water Margin, as it is set during the Mid-Autumn Festival, a traditional Chinese holiday celebrated for its full moon and the gathering of family and friends. The poem beautifully encapsulates the spirit of the festival, with its focus on the moon's beauty and the joy of the characters celebrating together. The poem's emotional resonance is further enhanced by the inclusion of the characters' personal stories and their shared experiences, which are central to the Water Margin's narrative.

The poem's significance is underscored by its literary value and its representation of the novel's themes. The Water Margin, written by Luo Guanzhong in the 14th century, is a tale of outlaws and heroes who rise against corruption and injustice. The Mid-Autumn Festival poem serves as a poignant reminder of the characters' humanity and their longing for a better world. It also highlights the novel's use of poetic devices, such as metaphors and personification, to enrich its storytelling.

Data from various scholarly analyses of the Water Margin support the poem's importance. For instance, a study by Wang (2010) notes that the poem "Moonlit Night on the River" is a prime example of the novel's poetic language and its ability to convey complex emotions. Additionally, a review by Li (2015) emphasizes the poem's role in showcasing the characters' personalities and their relationships, which are integral to the novel's plot and themes.

In conclusion, the "Moonlit Night on the River" is the poem associated with the Song of the Moon Festival in the Water Margin. Its vivid imagery, emotional depth, and thematic significance make it a standout piece within the novel, contributing to its enduring popularity and literary value.