One day, the air was warm, the Luxembourg was inundated with light and shade, the sky was as pure as though the angels had washed it that morning, the sparrows were giving vent to little twitters in the depths of the chestnut-trees. Marius had thrown open his whole soul to nature, he was not thinking of anything, he simply lived and breathed, he passed near the bench, the young girl raised her eyes to him, the two glances met. - ‘Effect of the spring’
The Jardin du Luxembourg where Marius fell in love with Cosette. Her bench would have been in one of the eastern alleys, you can take long strolls between the trees there.