A cruise through Denmark could visit some of the neighboring regions, like:

• Scandinavia
  (Norway, Sweden, Finland)
• ​​The British Isles
  (England, Scotland, Wales, Northern Ireland, Ireland)
• Russia 
  (St. Petersburg)
• The Baltic States
  (Estonia, Latvia, Lithuania)

• Aurora Expeditions mission is to maximize your time on the trip by bringing you close to the action, inspiring you with the amazing scenery while awakening you to environmental concerns. Their expeditions cross the infamous Denmark Strait in some of nature's worst conditions. The Greg Mortimer is a cutting-edge vessel capable of handling any mission.
• Quark Expeditions is the leading provider of polar expeditions to the Antarctic and the Arctic sails through the rough seas of the Denmark Straits, your pathway toward Iceland. The expedition team keeps you informed and entertained with history presentations about Arctic exploration and the seabirds you’ll see soaring above your ship Ocean Adventurer.
• Silversea Cruises offers an elegant lifestyle of all-inclusive ultra-luxury cruising across the Denmark Strait aboard intimate luxury cruise ships Silver Cloud and Silver Whisper.
• Ponant promises luxurious sailing moments along the coastline of Denmark: the capital and largest city of Copenhagen aboard its sleek and intimately sized yachts, such as Le Champlain, all of which sail under the French flag.
• Lindblad Expeditions has a top expedition team with the knowledge and passion for this Scandinavian region. Naturalists illuminate the geology of Denmark while historians add insight, depth, and clarity to each of the fascinating places you explore. Plus, get top shots with the help of a National Geographic photographer aboard the National Geographic Resolution. 
• Poseidon Expeditions is a leading polar cruise operator with itineraries that crosses the Denmark strait aboard the Sea Spirit.
• Hurtigruten. A Norwegian cruise line headquartered in Tromsø, Norway, has brand new ships, MS Roald Amundsen and MS Fridtjof Nansen that combine cutting-edge maritime construction with timeless Scandinavian interiors and environmentally-sound hybrid technology.