var nodes_merged = ee.FeatureCollection("projects/sat-io/open-datasets/SWORD/nodes_merged");
var reaches_merged = ee.FeatureCollection("projects/sat-io/open-datasets/SWORD/reaches_merged");

// Define different styles for each FeatureCollection
var nodeStyle = {
  color: 'red',
  width: 2
};

var reachStyle = {
  color: 'blue',
  width: 1
};

// Add each FeatureCollection with its own style
Map.addLayer(nodes_merged, nodeStyle, 'Nodes');
Map.addLayer(reaches_merged, reachStyle, 'Reaches');
