When building interactive maps with React and Leaflet, you need to prioritize both accessibility and mobile responsiveness to create inclusive, user-friendly experiences. Accessibility ensures that everyone, including users with disabilities, can interact with your maps effectively. This involves supporting keyboard navigation, providing clear ARIA labels, and ensuring that all interactive elements are reachable and understandable by assistive technologies. For keyboard navigation, make sure users can tab through map controls and focus on markers or popups. Use aria-label attributes on controls and custom UI elements to describe their function. Avoid relying solely on color to convey information, and provide descriptive text for any icons or images used within the map.

Equally important is designing for mobile responsiveness. Responsive maps adapt to various screen sizes and orientations, ensuring usability on smartphones, tablets, and desktops. Achieve this by using flexible layouts, setting the map container's width and height with relative units like percentages or viewport units, and ensuring that controls and popups scale appropriately. Test map interactions such as zooming, panning, and tapping on touch devices to confirm a seamless experience. Consider hiding or rearranging less essential UI elements on smaller screens to maximize the visible map area and prevent clutter.

By combining strong accessibility practices with robust responsive design, your React Leaflet maps will be usable and enjoyable for all users, regardless of their abilities or devices.